Cap-nut.



H. W. EDEN.

CAP NUT.

APPLICATION FILED APR. 1, 1909.

Patentd July 4, 1911.

milnrnr-rn Atlunngn UNITED STATES HAROLD w. EDEN, yon DETROIT, mcmean'.

I GAP-NUT.

Specification of Letters Patent. Application filed April 1, 1909. Serial No. 487,193.

Patented July 4, 1911.

To all whom it may concern:

Be it known that I, HAROLD W. EDEN, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Cap-Nuts, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make anduse the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to cap nuts, and has for its object an interiorly threaded tubular member adapted to be used as a nut or bur in connection with a thread bolt or exteriorly threaded tube, and its novelty consists in an interiorly threaded tube. made. by pressing the tube against a threaded die, in this instance being similar in structure to .the threaded end' of a bolt, and difl'ering from the ordinary tap with which screws are made, inthat it is provided with no longitudinal grooves, and is not used as a cutting tool, but simply as a resistance tool, into the interstices of which the metal of the nut or cap is forced.

In the drawing :Figure 1, shows the nut or cap in plan v1ew.v vFig. 2, is a cross section, through the center of the nut showing the inner surface. Fig. 3," is a perspective, showing the external appearance. Fig. 4, is an elevation, showing the appearance of the partially finished nut. Fig. 5, is a section showing the partially finished nut. Fi 6 is a plan View, showing the, ,blank which the nut is formed.

In producing this nut, a round blank 1, Fig. 6, is cut from sheet metal. At the first operation, this is dished and drawnby compressing the'edges and drawing the metal into the cup shaped form shown, in Fig. 4. "The third operation results in making the finished nut, and consists in inserting'a screw threaddie (not shown) into the cup 2, and forcibly compressing the metal of the side walls 3 of the cup 2 against the screw'thread' die, with a force sufiicient to cause the metal to flow into the interstices or grooves between the threads, formin the interior threads 4,

" shown in Fig. 2, an by suitable shaping of the face of the die or other instrument with which' pressure is exerted. upon the outside of the blank, forming the exterior projections5, shown in Figs. 1 and 3, which serves as a wrench-hold to turn the nut. A finaloperationpunches out aportion of the web 6, and turns in the margin around the punched-out portion, forming the finished edge or stop shoulder 7, shown in Fig. 2.

If desired, this edge may be cut off; by a trimming tool, leaving a nut, through which the bolt may entirely run. With well made tools, the thread 4. is continuous, no break being visible-in it between faces,'as a and b,

Fig. 1, even by the use of a magnifying glass.

What I claim is 1. A cap screw stamped from a blank,the

same beingcentrally apertured and-having the margin of the aperture'inturned to form a stop shoulder, substantially as described.

2. A cap screw stamped from a blank and having a body portion internally stampthreaded and externally stamp-ribbed, and

having one end thereof apertured and turned into form a stop shoulder, substantially as described.

3. A ca screw having a-tubular portlon stamped om a blank and centrally apertured, and internally threaded and externally ribbed, and having a tubular end inturned, substantially as described.

4. A cap screw, having a cyllndrical portion' stamped from a blank, said portion be-.

ing internally-threaded and externally ribbed for wrench engagement, and having one of its ends turned in to form a stop shoulder,

substantially as described. In testimony whereof, I signthis specification in the presence of two witnesses.

HAROLD W. EDEN.

'Witnesses: a

' WILLIAM'M. SWAN,

ALECIA TowNsEND. 

